C is starting swim lessons in the fall and I'll be in my third trimester. I usually wear a maternity rash guard when we are at the beach, but for swim lessons a regular tanking or one piece seems better. However, don't want to spend much at all since it's short term. Any recommendations, places that include free shipping? Don't need anything else from old navy so don't want to spend $50 for free shipping. Ideally under $15...